package/dnsmasq/dhcp-script

#!/bin/sh

# Invoked by dnsmasq when there is lease activity
# Fingerprints compatible with fingerbank.
# https://github.com/inverse-inc/fingerbank/blob/master/dhcp_fingerprints.conf

. /etc/utils.sh

fingerprint="$DNSMASQ_REQUESTED_OPTIONS"
cmd="$1"
mac="$2"
# dnsmasq also passes in:
# ip="$3"
# hostname="$4"

if [ "$cmd" = "add" ] || [ "$cmd" = "old" ]; then
  if [ ! -z "$DNSMASQ_VENDOR_CLASS" ] && runnable dhcpvendortax; then
    dhcpvendortax -l "$mac" -v "$DNSMASQ_VENDOR_CLASS" | logos taxonomy
  fi
  if [ ! -z "$DNSMASQ_SUPPLIED_HOSTNAME" ] && runnable dhcpnametax; then
    dhcpnametax -l "$mac" -d "$DNSMASQ_REQUESTED_OPTIONS" \
        -h "$DNSMASQ_SUPPLIED_HOSTNAME" | logos taxonomy
  fi
fi

FILE="/config/dhcp.fingerprints"

if [ -z "$mac" ]; then
  exit 0
fi

otherprints=$(head -n 256 "$FILE" | grep -vs "$mac")
if [ "$cmd" = "del" ]; then
  atomic "$FILE" "$otherprints"
  exit 0
fi

if [ -z "$fingerprint" ]; then
  exit 0
fi

newprints="$mac ${fingerprint}
${otherprints}"

atomic "$FILE" "$newprints"

exit 0